Multimeter, counter, powersupplys, spectrum analyzer, frequency-generator and many more devices out of the measurement range are equiped with this universal bus to transfer commands and measurements.
GPIB General Purpose Interface Bus
IEEE488.1 - definition of connectors, electrical parameters and transferprotocoll
IEEE488.2 - expansion of IEEE488.1 with formats of commands and responses
maximum bus length - the line-drivers of the interfaces are developed for a special load which should not be exceeded. The corresponding length of the bus is measured from the first to last device and is 20 meters maximum.
maximum device count - there was a maximum of 15 devices defined. You may adjust the device-adress beween 1 and 31 for each device. The maximum of connected devices depends shurely to the power of the line-drivers.
Connection-topologie - following the standard definition, the device may be connected within star- or bus-topology. Practically you should not mix those two.
MBps - Millionen Bytes per second.